The company said in its filing that various carbon regulation cost estimates, or proxy costs, were appropriately used in different calculations. And Exxon insisted that the numbers were never changed to mislead investors.

"ExxonMobil's use of different metrics, in different circumstances, to accomplish different goals evinces prudent financial stewardship, applying appropriate assumptions in appropriate cases. There is nothing untoward or surprising about any of this," the company's brief states.

The company also alleged that Schneiderman is engaged in a "political witch hunt" and is trying to sway potential jurors if a case ever goes to trial.

"It is an abuse of the powers of his office and the court system itself, furthering only the attorney general's transparent political ambitions and ultimately bound to taint a prospective jury pool," the company says.